3 EJOT Spiralform screws are special fasteners for safe and problemfree screw fixings into metallic materials, especially steel and stainless steel. Characteristics: Spiralform thread EJOT Spiralform screws have four small lobes that are positioned at 9 around the diameter of the screw and run spirally along the length of the thread. The thread that is formed by the lobes corresponds to metric ISOstandard thread DIN 13, tolerance class 6H. This also meets the requirements of VDE. EJOT Spiralform The product Spiralform Plus FormingPoint The Spiralform PlusPoint and cylindrical thread is designed to achieve low thread forming torque making the initial thread forming process easier. Circular Section The circular section and small lobes of the Sprialform thread allow the thread to be formed easily but at the same time ensuring that optimum contact between the screw thread and mating materials is achieved. This results in a consistently high strength process capable joint. Wide range of materials EJOT Spiralform screws exist in a range of different strengths and materials (see table). The EJOT Spiralform product family The requirements for thread forming screws differ from application to application. Therefore we have developed an EJOT Spiralform product family which meets the different demands. Type Applications Versions Spiralform Steel St 37 to HB 12 (HV 125) the advanced development for low thread forming torques Spiralform Plus Steel St 37 to HB 12 (HV 125) case hardened acc. to DIN 75 DIN EN ISO 785 respectively (however min. breaking torque and min. tensile strength according EJOT WN 1361 part 1)* surface hardness min. 45 HV stainless steel * In order to minimize risk of hydrogen embrittlement. 3

4 EJOT Spiralform Thread design Thread forming The better technical solution Thread forming and inserting at once The result of forming is always an exactly matching, gapfree female thread. This means increased safety against loosening under dynamic stress. Where screw joints need to withstand extreme dynamic or thermal conditions, the combination Spiralform with EJOT VIBRALOK is recommended (see picture). The formfitting thread can take up loads along the whole insertion depth. This means higher strength within the screw joint. The formed and work hardened zone enables higher pullout forces compared to cut threads. Problems due to swarf in electrical or pneumatic components resulting from thread cutting of machine threads are now a thing of the past. The formed female thread of the EJOT Spiralform screw conforms to metric ISO standard thread according to DIN 13 tolerance field 6H. Metric screws can also be assembled manually afterwards. M4 x 16 in a precut thread Spiralform M4 x 16 4

5 Thread forming The better economical solution The unit cost of a traditional metric fastener makes up only 2% of the overall cost of the total screw joint. The remaining 8% of the cost are made up of the cost of thread cutting, deburring and cleaning operations, consumables such as screw taps and pitch gauges, quality control and any rework and rejected parts, not to mention the cost in time of each of these operations. EJOT Spiralform Thread Design Thread forming using the EJOT Spiralform screw on the other hand is far more economical than thread cutting since many of the operations and consumables mentioned above are simply eliminated. Metric DIN 13 Spiralform Plus Assembling washer l Hold up l l Assembling nut l l Tapping operation m m l Drilling hole l l l l Screw installation l l l l Assembly costs Unit price Bolt and nut Semsbold and nut Bold and nut EJOT Spiralform 5

10 EJOT Spiralform Design recommendations NominalØ 2,5 3, 3,5 4, 5, 6, 8, length of the forming point (max. 4 x P) 1,8 2, 2,4 2,8 3,2 4, 5, P = pitch This applies only for the forming point type Plus. The level of installation torque depends on several parameters. The most important ones of them are type of material and its strength, required insertion depth (material thickness), kind of surface treatment for screw and work material, potential lubricants and the used prehole diameter. Below you will find general recommendations in terms of quality for sheet and steel. For the precise design of your application we offer the service of our state of the art EJOT APPLITEC laboratory. For more details please contact your responsible application engineer or the EJOT Hotline. When using the EJOT Spiralform Plus thread geometry, please ensure sufficient insertion depth for blind holes in particular. The screw point Plus reduces the number of fully load carrying threads by about four (see table opposite). Spiralform Plus should be used where sufficient insertion depth and hole clearance are available. For applications in light weight alloys and die cast materials we advise using the EJOT ALtracs screw. For thin sheet metals with a thickness of,4 mm to 1, mm the EJOT FDS fastener is recommended. In order to enable plane bearing surfaces for the clamped components, please chamfer the top of the pre hole. This design step also improves the start of the insertion process. Hole dimensioning for sheet metal through drafts Core hole diameter for sheet metal through drafts in steel HB Nominal thread diameter M 2,5 M 3 M 3,5 M 4 M 5 M 6 M 8 Core hole diameter d [mm] Through draught depth 2,25 2,31 2,7 2,76 3,15 3,23 3,6 3,68 h = (1,5 2) s 4,5 4,58 5,4 5,47 7,3 7,39 1

14 Your system partner Test rack at APPLITEC Design Consultation A major consideration of today s product manufacture is the basic need to be cost competitive. Significant in achieving this objective is the design process. No other part of the cost structure is influenced more than by design. Generally speaking, the development of a product, which represents about 1% of the overall costs, determines about 7% of the costs for the final product. Often the design of the fixing is considered to be of low importance; however, it is the fastener that holds the components together to make the finished product. With this in mind the design engineer should consider which fastening method to use during the design conception stage to avoid expensive design changes late on in the design process or even when the product goes into production. To assist our customers in this process EJOT offers support during the design stage through comprehensive application engineering services. These services provide accurate information on product performance and result in design recommendations that can be used safely on the production line. Consequent Application Engineering By continuously working with our customers and their application problems, EJOT has amassed a comprehensive understanding of fastener techniques that has lead to a number of significant innovations. It is our goal to continually improve our products to meet the ever increasing demands of our customers. In addition to our highly qualified engineers and applicationengineering advisers, we offer the service of our application laboratory known as the EJOT APPLITEC. In the APPLITEC we carry out test procedures on our customer s applications that enables us to thoroughly analyse the strength and capability of their parts. It is here that new fastening techniques are also developed. The knowledge EJOT has gained over the years is passed on to our customers finding the most effective solution supporting their efforts in establishing rational fastening and assembly techniques. Detailed test reports, on site technical advice, acknowledged seminars and technical publications demonstrate our continued commitment to impart our knowledge. Internal seminar Test report 14

15 Logistic and Data Exchange It is our aim to keep procurement and warehousing costs as low as possible by simultaneously offering product availability and quality. With respect to simplified procuring processes, EJOT offers a variety of cost reducing procedures and services. The continued analysis of our customer s demands and advanced logistics procedures are leading to high availability of our products. Skeleton contracts and delivery schedules via electronic data interchange facilitate and accelerate the processing times of our products. Your system partner Quality for Automated Assembly The fasteners grade of purity has a significant impact on the minimisation of failure and thus leads to a high availibility of the assembly machine. Historically, the standard quality in commercial fastener manufacture was not sufficient for today s high quality requirements since originally it had been designed for mainly manual assembly. EJOT introduced the EJOMAT Quality to ensure the most costeffective usage of our customers automated assembly machines. The grade of purity offered by EJOMAT quality is 1 times higher than the usual standard quality which means increased availability of assembly machine and decreased assembly down time costs. EJOMAT, quality that pays for itself. EJOT Sales Organization In addition to EJOT companies throughout Europe a growing number of Licensees in North & South America and Asia ensures that product availability and local support is Global. Contact details can be found on our Homepage Modern PPSsystems lead to high accuracy in supplying and short through put times EJOMAT for fully automated assembly 15

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